How can I model electricity when data on the residual grid mix is not available?

Version 5.0.0 of the General Programme Instructions (GPI), and many PCRs, say that the  electricity consumption mix on the market shall not be used to model processes over which the manufacturer (often the EPD owner) has direct control. 

This means that unless specific electricity has been purchased (demonstrated by a Guarantee of Origin or similar), the residual grid mix shall be used. If the residual grid mix of the market is not publicly available, it can conservatively be assumed to be the consumption mix of the market minus the renewables of that mix.

For older PCRs,  it is instead accepted to assume the electricity consumption mix on the market also for processes over which the manufacturer has direct control (if specific electricity demonstrated by a contractual instrument has not been purchased). 

Furthermore, note that the composition of the residual grid mixes on the market are available for all EU countries and a few additional European countries through the Association for Issuing Bodies (AIB) at https://www.aib-net.org/facts/european-residual-mix.